python 在windows下監聽鍵盤按鍵
阿新 • • 發佈:2018-10-30
else name setw 程序 是我 user api put use
python 在windows下監聽鍵盤按鍵
使用到的庫
- ctypes(通過ctypes來調用Win32API, 主要就是調用鉤子函數)
使用的Win32API
- SetWindowsHookEx(), 將用戶定義的鉤子函數添加到鉤子鏈中, 也就是我們的註冊鉤子函數
- UnhookWindowsHookEx(), 卸載鉤子函數
- CallNextHookEx()在我們的鉤子函數中必須調用, 這樣才能讓程序的傳遞消息
在沒有鉤子函數的情況下windows程序運行機制
- 鍵盤輸入 --> 系統消息隊列 --> 對應應用程序的消息隊列 --> 將消息發送到對應的窗口中
在有了鉤子函數的情況下windows程序運行機制
- 鍵盤輸入 --> 系統消息隊列 --> 對應應用程序消息隊列 --> 將消息發送到鉤子鏈中 --> 消息一一調用完畢所有的鉤子函數(需要調用CallNextHookEx函數才能將消息傳遞下去) --> 將消息發送到對應的窗口中
示例程序
- 註意:
- 在程序中, 我們通過CFUNCTYPE返回一個類對象, 通過該類對象可以實例化出我們需要的c類型的函數, 但是如果不將他放在全局的話則會失去效果, 因為在C語言中函數是全局的
# -*- coding: utf-8 -*- import os import sys from ctypes import * from ctypes.wintypes import * """ define constants """ WH_KEYBOARD = 13 WM_KEYDOWN = 0x0100 CTRL_CODE = 162 class JHKeyLogger(object): def __init__(self, user32, kernel32): """ Description: Init the keylogger object, the property ‘hook_‘ is the handle to control our hook function Args: @(dll)user32: just put windll.user32 here @(dll)kernel32: just put windll.kernel32 here Returns: None """ self.user32_ = user32 self.kernel32_ = kernel32 self.hook_ = None def install_hookproc(self, hookproc): """ Description: install hookproc function into message chain Args: @(c type function)hookproc: hookproc is the hook function to call Returns: @(bool): if SetWindowHookExA() function works successfully, return True else return False """ self.hook_ = self.user32_.SetWindowsHookExA( WH_KEYBOARD, hookproc, self.kernel32_.GetModuleHandleW(None), 0) if not self.hook_: return False return True def uninstall_hookproc(self): """ Description: uninstall the hookproc function which means pick the hookproc pointer off the message chain Args: None Returns: None """ if not self.hook_: return self.user32_.UnhookWindowsHookEx(self.hook_) self.hook_ = None def start(self): """ Description: start logging, just get the message, the current thread will blocked by the GetMessageA() function Args: None Returns: None """ msg = MSG() self.user32_.GetMessageA(msg, 0, 0, 0) def stop(self): self.uninstall_hookproc() def hookproc(nCode, wParam, lParam): """ Description: An user-defined hook function Attention: here we use the global variable named ‘g_keylogger‘ """ if wParam != WM_KEYDOWN: return g_keylogger.user32_.CallNextHookEx(g_keylogger.hook_, nCode, wParam, lParam) pressed_key = chr(lParam[0]) print pressed_key, # hit ctrl key to stop logging if CTRL_CODE == lParam[0]: g_keylogger.stop() sys.exit(-1) return g_keylogger.user32_.CallNextHookEx(g_keylogger.hook_, nCode, wParam, lParam) # Attention: pointer must be defined as a global variable cfunctype = CFUNCTYPE(c_int, c_int, c_int, POINTER(c_void_p)) pointer = cfunctype(hookproc) g_keylogger = JHKeyLogger(windll.user32, windll.kernel32) def main(): if g_keylogger.install_hookproc(pointer): print ‘install keylogger successfully!‘ g_keylogger.start() print ‘hit ctrl to stop‘ if __name__ == ‘__main__‘: main()
python 在windows下監聽鍵盤按鍵